Theoretical study of structure and production of as a gateway to sd-shell hypernuclei

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• 作者：Atsushi Umeya^a ; ^{aumeya@nit.ac.jp" class="auth_mail" title="E-mail the corresponding author} ; Toshio Motoba^b ; ^c
• 关键词：Λ-hypernucleus ; sd-shell ; (K&minus ; π&minus ; )(K&minus ; π&minus ; ) reaction ; Electromagnetic transition
• 刊名：Nuclear Physics A
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：954
• 期：Complete
• 页码：242-259
• 全文大小：977 K

文摘

Energy level structures of the typical light sd  -shell hypernucleus ${}_{\mathrm{\Lambda }}{}^{19}\mathrm{F}$, together with ¹⁸F, have been studied in detail with the multi-configuration shell model. Both positive-parity and negative-parity nuclear core excitations are fully taken into account by removing the spurious center-of-mass excitation effects. Corresponding to the J-PARC proposal of the ¹⁹F (K⁻,π⁻γ$K^{-},{\pi }^{-}\gamma$) ${}_{\mathrm{\Lambda }}{}^{19}\mathrm{F}$ experiment, the production cross sections have been estimated extensively, including the angular distributions. Starting with the elementary amplitudes for the K⁻n→Λπ⁻$K^{-}n\to \mathrm{\Lambda }{\pi }^{-}$ process, the microscopic DWIA calculations at high energy kaon momenta up to 1.8 GeV/c$1.8\text{GeV}/c$ have been carried out for the first time. The calculated wave functions are also used to estimate the electromagnetic transition probabilities for both ¹⁸F and ${}_{\mathrm{\Lambda }}{}^{19}\mathrm{F}$. The detailed γ-decay schemes are presented and discussed.